Improvement in coal-breakers



H.'C. ROGERS.

Coal Breakerlooth. v v

No. 43.133. Patented June 14, 1864'.

I [hm-2:507: 775 866066.-

UNITED STATES PATENT OFFICE.

IMPROVEMENT IN COAL-BREAKERS.

Specification forming part of Letters Patent No. 13, I 33, dated June 14, 1864.

To all whom it may concern Be it known that I, H. C. ROGERS, of Scranton, in the county of Luzerne and State of Pennsylvania, have invented a new and Improved Tooth for Coal-Breakers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in Which Figure 1 represents a side elevation of my invention. Fig. 2 is a plan or top view of the same.

Similar letters of reference in both views in licate corresponding parts.

To enable those skilled in the art to make and use my invention, I will proceed to describe it with reference to the drawings.

The tooth is designed for that class of rollers known as the batten rollers, or for coalbreakers in which two toothed rollers runn'ng in opposite directions are employed for the purpose of breaking the coal. The main body A of the tooth is formed of the softest wrought-iron. The point a. of the tooth consists of a piece of steel which extends down on the edge of the tooth near to the roller, as clearly shown in Fig. 1 of the drawings. In order to insert saidsteel point, the edge of the tooth is provided with a V-shaped groove, and after the point is inserted it is permanently united with the wrought-iron body b of the tooth by welding. It is then embedded in the sand of the mold for the castiron cylinder, having the base of the tooth projecting into the mold about two inches. The molten iron is then poured in and the the tooth is thus firmly embedded in the body of the cylinder. By referring to Fig. l of the drawings it will be noticed that in order to make the tooth perfectly firm, it is made wider at the base, in the form of a pyramid. After the teeth are all in place the steel points are properly tempered. The advantages of this tooth over the ordinary cast-iron tooth are manifest. The cast-iron tooth soon wears away at the point and becomes very blunt, and thus rather grinds than breaks the coal, producing a large percentage of waste or culm, whereas my improved tooth. always presents a pick or sharp point, thus cracking the coal with little or no waste, and when embedded in the manner hereinbefore described it remains forever firm and all the grinding of the teeth, as the coal passes through, serves to sharpen and perfect the point byv wearing away the softer iron and leaving the hardened steel prominent.

I do not claim, broadly, as my invention so uniting two metals of different hardness that as the soft metal wears away the hard metal is left prominent; but,

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

As a new article of manufacture, the coalbreaker tooth hereinbet'ore described, consisting of a pyramidal or tapering body, A, of soft metal, to be secured in the roller R by casting, and a point of steel welded in a groove in the front of the wrought-iron body A.

H. 0. ROGERS.

Witnesses:

JAMES NOLAN, J. R. FORDHAM. 

